Posts: 197
Joined: 12/5/2006 From: Auburn,
AL, USA Status: offline
Hey guys, I got inspired to make a pbf flyer and started on one tonight. I need some opinions though. I havent really searched for that cloroplast sign board and I threw away all my presidential campaign signs so I dont have any of that lying around. I think I know of a sign place close by if my fowlowing options wont work. Any way I wanted to see what you would think of my plan. Instead of that chloroplast board I had some lightweight 4x8 sheet of that insulation styrofoam board that is just about an inch thick. Its pretty light but I dont have the other material to compare it to so I dont know how it is for weight wise, I imagine pretty close. I was just going to paint it then cover it with clear packaging tape to protect it as much as possible. I made the motor mount out of oak and the back bone or spine down the middle out of pine. I am planning on putting an old os 25 on it to start off with and go from there. I could even shape the wing into a nice airofoil since it is 1 inch thick if need be. Do you think my setup will be ok or should I just go down and keep looking for cloroplast board?
Posts: 287
Joined: 10/24/2003 From: Derry,
NH, USA Status: offline
I built an electric PBF with foam. Here are some pictures. It didn't fly too great, is was way underpowered. Yep, brushed motor and NiCd's.
I can't see any reason why the foam would not hold up to glow power, JK aerotech kits combat planes out of that stuff. You reinforce them with strapping tape and then cover with packing tape. Works great, and they are tough. Check out there website jkaerotech.com for a good way to do hinges if you decide to try this. I'd also reinforce the foam with strapping tape like they do.
1" sounds thick to me, considering coroplast about a quarter of that. If you could cut it in half that would probably be a good place to start. Try it out. An airfoil is not really necessary. You could round the L.E. though.
Personally, I would just get some coroplast. It is really inexpensive and even if the sign shop doesn't have any you can order it online.
Posts: 571
Joined: 11/3/2003 From: muskegon,
MI, USA Status: offline
quote:
ORIGINAL: davidgeorge212 Instead of that chloroplast board I had some lightweight 4x8 sheet of that insulation styrofoam board that is just about an inch thick. Its pretty light but I dont have the other material to compare it to so I dont know how it is for weight wise, I imagine pretty close. I was just going to paint it then cover it with clear packaging tape to protect it as much as possible. I made the motor mount out of oak and the back bone or spine down the middle out of pine. I am planning on putting an old os 25 on it to start off with and go from there. I could even shape the wing into a nice airofoil since it is 1 inch thick if need be. Do you think my setup will be ok or should I just go down and keep looking for cloroplast board?
Thanks, David G.
Dave
You're over-thinking it!!!
Use Dave McDonald's plans, they're free! Forget about the airfoil and the styro, it's too fragile and complicated. Just stick with what works! You'll have a lot more fun if it's indestructable!!!
Posts: 1326
Joined: 1/4/2002 From: Eldon, MO, USA Status: offline
DG, Yes, a foam PBF will fly.......but probably not as well as a coro PBF. Plus a foam PBF definitely won't survive the constant abuse that a coro PBF can take.
Hey, half the fun of flying a PBF comes from the pure lack of fear of crashing. You'll break props......lots of props......but otherwise a coro PBF is pretty much indestructible.
Posts: 197
Joined: 12/5/2006 From: Auburn,
AL, USA Status: offline
the only reason i was suggesting the styrofoam is because thats what I had. the coro board is harder than you think to come by at least where I live. I finally found a little sign shop next to where I work who sold me 3 sheets 24 x 36. the coro was a little more expensive then I originally thought it was going to be, It cost about 6 dollars a sheet for 24 x 36. BUt never the less I got some and I will make it now according to plans. I will have spare to if I crash it to bad.
Posts: 214
Joined: 6/14/2002 From: Groton, NH, USA Status: offline
Love the "See through window".........lol
Right now I am into EPP foam with brushless with lipos but I have a PBF sitting on top of one of my Bridgeports waiting for the next urge. COro is great~ Bluecor is cool. Depron is also cool.....I have planes and ufos (lol) built out of all material.
You just got to try diff stuff and see how it flys. As long as it is fun................then just do it. I have even built crap out of cardboard, ya, real cardboard.
If its not fun........stop and re read this forum and find a part of it to follow and try. Last weekend my son and I made 4 rockets out of christmas wrapping rolls and easter eggs for nose cones. Had a ball. made the fins out of foam meat trays and hot glued all together. What a blast.
Just toss somthing together and try it. If it don't work, try something else.
RC Universe is the greatest place of combined info in the world.............read tons, ...........ask only when needed........and create often.
I even hot glue together the wally world foamies just to have fun..........
_____________________________
Never Give Up www.twwrc.homestead.com/current.html
Posts: 287
Joined: 10/24/2003 From: Derry,
NH, USA Status: offline
I built a new PBF last night. OS 40 FP, Futaba 3003 servos, JR600 RX, 700mAh NiMh battery.
Take a look at my rudder, I made it like that because when the elevator/aileron stick is in the lower corner, the elevons move that far. Elevator only is 2" of throw, and same with the aileron. When you do them at the same time is moves a lot farther.
Do you think this will have enough rudder authority or should I change something? Its easy enough to change the v-stab and I rather do it now since I can't fly it until next week. What do you think?
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RE: Build your own PBF (Pizza Box Flyer, Flying Pi... - 
